Yucca Fries with Banana Ketchup

Name: Yucca Fries with Banana Ketchup
Ingredients: 2 large ripe bananas, peeled and chopped; 1 1/2 cups vegetable stock; 1 small onion, halved and thinly sliced; 1/2 cup water; 4 whole pickled jalapeños, stems discarded, plus 2 tablespoon pickling liquid from the jar; 1/4 cup thinly sliced garlic cloves; 3 tablespoons finely chopped peeled fresh ginger; 1 cup ketchup; 1 cup lightly packed Thai basil; Salt; Pepper; 3 pounds yucca (about 4 yucca); Vegetable oil, for frying; Lime wedges, for serving